| Jeffrey | Baines | Morgan's husband. aka: Jeff. |
| Morgan | Baines | Will and Sadie's neighbor. |
| Officer | Bisset | A police officer. |
| Bert | Campanares | A basketball player. |
| Stephen | Colbert | An American comedian. |
| Sadie | Foust | A physician. Will's wife. |
| Will | Foust | A professor teaching human ecology. |
| Mr. | Jansen | Otto's teacher. |
| Carrie | Laemmer | Will's student. |
| George | Nelson | Will and Sadie's neighbor. |
| Erin | Sabine | Will's first fiancé. |
| Dr. | Sanders | Sadie's colleague. |
| Charlotte | Sneider | Sadie's stepmother. |
| Alice | | Will's sister. |
| Amanda | | A doctor. |
| Amy | | Berg's daughter. |
| Andrea | | Will's colleague. |
| Bear | | Mouse's favorite stuffed toy. |
| Berg | | A police officer. |
| Bert | | A guinea pig. |
| Beverly | | Sadie's therapist. |
| Bob | | Sadie's family's therapist. |
| Camille | | Will's other woman. |
| Courtney | | Jeffrey's first wife. |
| Elizabeth | | Imogen's half-sister. |
| Emily | | One of Sadie's friends. |
| Emma | | A receptionist. |
| Imogen | | Will's niece. |
| Jack | | One of Sadie's friends. |
| Jessica | | Mother of Tate's buddy. |
| Joyce | | Nurses department head. |
| Karen | | One of Sadie's new acquaintances. |
| Max | | Fake mom's dog. |
| Mouse | | Jeffrey Baines' daughter. |
| Otto | | One of Will's children. |
| Patty | | Morgan's mother. |
| Poppy | | George Nelson's wife. |
| Samantha | | Will's acquaintance. |
| Susan | | One of Sadie's new acquaintances. |
| Tate | | One of Will's children. |
